When Marge bumps her head on a stool by her maximum-strength cleaning solution she uses to clear the house before her free housecleaning (which "she" won thanks to Homer painting the address number on the curb in front of the house), she gets amnesia, but quickly remembers everything except for two things - one, that she's married to Homer, and two, who Homer is.

Looking for a way to get easy money, Bart, Milhouse, and Nelson go around town spray-painting people's addresses on their curbs and make them pay them ten dollars, and when Ned Flanders pay them and ask them to paint his garage for 0, they freak out.

Looking for a way to get easy money, Bart, Milhouse, and Nelson go around town spray-painting people’s addresses on their curbs and making them pay them ten dollars for the unsolicited service.

It turns out to be a success, but after they add the “7” and the “4” to the curb of the Simpson house (742 Evergreen Terrace), Homer tells them that he will not pay, so they leave without finishing.